Bmw X3M X4M F97 F98 - Full Stage 2 package FJM700 - Custom Tuned

FJM680 Stage 2 Performance Package – BMW S58 Engine & Gearbox tune

Unlock the full potential of your S58-powered BMW with the FJM680 Performance Package, our comprehensive Stage 2 system, designed in-house to deliver maximum power, torque, and drivability. Developed and tested on our own vehicles, this package is engineered to elevate your M-car’s performance with no compromises, just proven results.

What’s Included in the FJM680 Package: 

• FEMTO ECU Unlock
We unlock your factory ECU to enable full tuning capabilities — allowing advanced strategies for ignition, fuel, boost, and torque, unleashing serious gains safely. (Fastest Turn around in the uk 3/4 days).

• FJM Catless Downpipes or HeatShielded Sports Cats 
Precision TIG-welded stainless-steel downpipes reduce backpressure, increase flow, and improve turbo efficiency, with integrated thermal shielding to manage heat effectively.

• FJM Midpipe Upgrade / Filter Delete
A single high-flow midpipe with integrated Filter delete enhances exhaust flow and sound. Expect a deeper tone, less restriction, and the raw, refined acoustics your S58 deserves.

• FJM Stage 2 Custom ECU Calibration (BootMod3 Licence included) Custom-mapped engine tuning specifically dialled in for this exact hardware combo. Enjoy optimised power, torque, and throttle response, all with OEM-level drivability.

• FJM Stage 3 XHP TCU Gearbox Tune
Stage 3 XHP Gearbox Mapping transforms the way your car shifts. Shift points in D and S modes are fully optimised for sharper acceleration under both part and full throttle. You’ll get approximately 25% faster shifts in D mode and up to 50% faster in S and M modes. The gear display shows clearly in the dash (where supported), and paddle response is near-instant. Features include rev-matched downshifting with throttle blips, raised torque limits, and increased line pressure for improved clutch holding power. True manual mode eliminates forced upshifts at the limiter, giving you full control. This is how the gearbox should have come from factory, refined, responsive, and ready to handle real performance. All our packages comes with Xhp gearbox map as this allows more torque through the gearbox. 

• FJM Performance Drop-In Filters                           High-flow filters engineered to fit your OEM airboxes. Enhanced airflow and filtration without compromising daily comfort or longevity.

Custom Tune Performance Figures (S58/FJM680 Package:

• Up to 700 bhp
• Around 900 Nm torque
• 0–60 mph: As quick as 2.7/3 seconds (xDrive)
• 100–200 km/h: ~ 6.2-6.5 seconds
• ¼ mile: 10’s mid to high

These are real-world figures based on full bolt-on builds using our custom calibration and hardware. With the right launch and tyres, this is a true 10 second-capable street setup. Figures are estimate as its totally dependent on your vehicles tyres, health etc, we will do 101% to acheive.

Compatible S58 Models:

• BMW X3M F97 Pre Lci
• BMW X3M F97 Lci
• BMW X4M F98 Pre Lci
• BMW X4M F98 Lci

Why FJ Motorwerkes?

At FJ Motorwerkes, we go beyond bolt-ons. Every FJM680 package is fully installed, road-tested, and calibrated by our in-house specialists, the same team trusted by top-tier enthusiasts and competitive builds. We build, refine, and prove our setups on the street and the track.

Ready to Build Your S58?

Contact FJ Motorwerkes today to schedule your FJM680 installation or to speak with our performance team about your next BMW M project.

A true hands-off, turn-key performance experience. We do the work.

Step 1 – Purchase Your Package

Choose your desired tuning or performance package and confirm your booking with us.

Step 2 – Consultation & Booking

One of our technicians will get in touch for a quick consultation to understand your needs and goals. We’ll then schedule your vehicle in at one of our locations.

Step 3 – Vehicle Drop-Off & ECU Unlock

Drop your vehicle at one of our secure locations in Cambridge, Peterborough, or Essex.

We remove the ECUs and send them to Finland for Femto unlock (required for custom tuning on locked ECUs).

Turnaround time is typically 3–5 working days. Your vehicle is stored safely on our premises throughout.

Step 4 – Performance Parts Installation & Testing

Once the ECUs return, we install all your selected performance hardware.

Your car is road tested to ensure everything is functioning safely and correctly.

Step 5 – Gearbox & ECU Tuning

We install the XHP gearbox map, followed by custom ECU tuning.

This process takes 1–3 days as we log and fine-tune every setup properly —

no base maps, no shortcuts.

We’ll also log Dragy times on request (fuel costs passed on). Please note we tune & map vehicle on 99RON FUEL TESCO MOMENTUM OR SHELL V POWER - PLEASE MAKE SURE AT LEAST 2 Week before booking this fuel type is being utilised for optimum results.

Step 6 – Vehicle Handover & Setup Review

Your car is ready for collection. One of our technicians or advisers will walk you through the full setup, provide usage guidance, and answer any final questions. Including BM3 Operation for Pop bangs and other gestures which maybe available within your BM3 licence.

This is a true hands-off service.

NOTE; All Bmw’s build after June 2020 require FEMTO

All tuning services and vehicle modifications offered by FJ Motorwerkes are strictly intended for off-road or motorsport use only. These services may not comply with local emissions or road safety regulations.